Since you ask I will reply.

The correct mathematical way to figure foc would be to use the whole point.On the other hand,the balance point of the shaft is usually in reference along with spine,and the carbon or aluminum doesn't have any idea how long the weight is up front it just reacts to the weight.This is strictly my opinion and that of some major arrow manufacturers.

Let me add this.If we are talking about a head that is very long,then maybe we need to account for it to some degree in figuring spine and foc.I really don't know because I have never used extremely long heads.Maybe the real answer is somewhere in the middle.

Edited by - tfox on 09/18/2002 16:23:41